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From "Carl Steinbach (JIRA)" <>
Subject [jira] Resolved: (HIVE-797) mappers should report life in ways other than emitting data
Date Mon, 07 Mar 2011 20:23:59 GMT


Carl Steinbach resolved HIVE-797.

    Resolution: Invalid

> mappers should report life in ways other than emitting data
> -----------------------------------------------------------
>                 Key: HIVE-797
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>            Reporter: S. Alex Smith
> Mappers which are performing a great deal of aggregation can be killed by time out even
if they are running successfully.  For example, in the following query the group by operator
stops the mapper from returning any rows of data until the map is entirely finished.  If the
data processing takes longer than the time-out limit, the job will fail.  The mapper should
instead offer the tracker some indication that it is busy working.  Alternatively, the tracker
could ping the mapper with an appropriate question / warning before it sends a kill signal.
> FROM (
>   FROM my_table
>   USING 'my_boolean_function'
>   AS boolean_output) a
> SELECT boolean_output, COUNT(1)
> GROUP BY boolean_output

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